Java tutorial
/** * Copyright (c) 2016, German Neuroinformatics Node (G-Node) * * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted under the terms of the BSD License. See * LICENSE file in the root of the Project. */ package org.g_node.micro.commons; import com.hp.hpl.jena.rdf.model.Model; import com.hp.hpl.jena.rdf.model.ModelFactory; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.PrintStream; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; import org.apache.commons.io.FileUtils; import org.apache.log4j.ConsoleAppender; import org.apache.log4j.Level; import org.apache.log4j.Logger; import org.apache.log4j.PatternLayout; import static org.assertj.core.api.Assertions.assertThat; import org.junit.After; import org.junit.Before; import org.junit.Test; /** * Unit tests for the {@link RDFService} class. Output and Error streams are redirected * from the console to a different PrintStream and reset after tests are finished * to avoid mixing tool error messages with actual test error messages. * * @author Michael Sonntag (sonntag@bio.lmu.de) */ public class RDFServiceTest { private ByteArrayOutputStream outStream = new ByteArrayOutputStream(); private PrintStream stdout; private final String tmpRoot = System.getProperty("java.io.tmpdir"); private final String testFolderName = "rdfServiceTest"; private final Path testFileFolder = Paths.get(tmpRoot, testFolderName); /** * Redirect Out stream and create a test folder and the main * test file in the java temp directory. * @throws Exception */ @Before public void setUp() throws Exception { this.stdout = System.out; this.outStream = new ByteArrayOutputStream(); System.setOut(new PrintStream(this.outStream)); Logger rootLogger = Logger.getRootLogger(); rootLogger.setLevel(Level.INFO); rootLogger.addAppender(new ConsoleAppender(new PatternLayout("[%-5p] %m%n"))); final String testFileName = "test.txt"; final File currTestFile = this.testFileFolder.resolve(testFileName).toFile(); FileUtils.write(currTestFile, "This is a normal test file"); } /** * Reset Out stream to the console and remove all created * folders and files after the tests are done. * @throws Exception */ @After public void tearDown() throws Exception { System.setOut(this.stdout); if (Files.exists(this.testFileFolder)) { FileUtils.deleteDirectory(this.testFileFolder.toFile()); } } /** * Check, that a Jena RDF model is written to file. * @throws Exception */ @Test public void testSaveModelToFile() throws Exception { final String outFileName = "testRdf.ttl"; final String outFilePath = this.testFileFolder.resolve(outFileName).toString(); final String outFileFormat = "TTL"; final String testString = String.join("", "[INFO ] Writing data to RDF file '", outFilePath, "' using format '", outFileFormat, "'"); final Model model = ModelFactory.createDefaultModel(); RDFService.saveModelToFile("", model, outFileFormat); assertThat(this.outStream.toString()).startsWith("[ERROR] Could not open output file"); RDFService.saveModelToFile(outFilePath, model, outFileFormat); assertThat(this.outStream.toString()).contains(testString); } /** * Test that an empty and a non empty RDF file can be opened. * @throws Exception */ @Test public void testOpenModelFromFile() throws Exception { final File currEmptyTestFile = this.testFileFolder.resolve("testEmpty.ttl").toFile(); FileUtils.write(currEmptyTestFile, ""); Model emptyModel = RDFService.openModelFromFile(currEmptyTestFile.toString()); assertThat(emptyModel.isEmpty()).isTrue(); final String miniTTL = "@prefix foaf: <http://xmlns.com/foaf/0.1/> .\n\n_:a foaf:name\t\"TestName\""; final File currTestFile = this.testFileFolder.resolve("test.ttl").toFile(); FileUtils.write(currTestFile, miniTTL); Model m = RDFService.openModelFromFile(currTestFile.toString()); assertThat(m.isEmpty()).isFalse(); } }